A MILITARY adviser to President George W Bush has warned that British forces will have to fight their way out of Iraq in an “ugly and embarrassing” retreat.

Stephen Biddle, who also advises the US commander in Iraq, said Iranian-backed Shi’ite militias in the south would try to create the impression they were forcing a retreat. “They want to make it clear they have forced the British out. That means they’ll use car bombs, ambushes, RPGs [rocket-propelled grenades] . . . and there will be a number of British casualties.”

The comments coincide with British military estimates that withdrawal could cost the lives of 10 to 15 soldiers.

Some British officers believe they are facing a “humiliating” retreat under fire to Kuwait or the southern Iraqi port of Umm Qasr.

“I regret to say that the Basra experience is set to become a major blunder in terms of military history,” said a